迷人的伸展树、、、
都是伸展树很裸的操作，没什么技术含量。
标记下放的时候注意一下就好。。。
#include<stdio.h>
#include<string.h>
#include<algorithm>
#include<iostream>
#include<vector>
using namespace std;
#define LL long long
#define maxn 220000
#define mem(a,b) memset(a,b,sizeof(a))
#define root10 ch[ch[root][1]][0]
#define root1 ch[root][1]
#define root11 ch[ch[root][1]][1]
#define lson ch[x][0]
#define rson ch[x][1]
#define INF ~0u>>2
int ch[maxn][2];
int pre[maxn];
int root,tot;
int size[maxn];
int val[maxn];
int rev[maxn];
int lazy[maxn];
int minn[maxn];
//----------------------
int num[maxn];
int st[maxn];
void Treaval(int x)
{
if(x)
{
Treaval(ch[x][0]);
printf("结点%2d:左儿子 %2d 右儿子 %2d 父结点 %2d size = %2d ,key = %2d\n",x,ch[x][0],ch[x][1],pre[x],size[x],val[x]);
Treaval(ch[x][1]);
}
}
void debug()
{
printf("root:%d\n",root);
Treaval(root);
}
void debug2()
{
puts("start:");
for(int x=1;x<=tot;x++)
{
printf("结点%2d:左儿子 %2d 右儿子 %2d 父结点 %2d size = %2d ,key = %2d \n",x,ch[x][0],ch[x][1],pre[x],size[x],val[x]);
}
}
//以上Debug
void push_down(int x)
{
if(lazy[x])
{
if(lson)
{
lazy[lson]+=lazy[x];
val[lson]+=lazy[x];
minn[lson]+=lazy[x];
}
if(rson)
{
lazy[rson]+=lazy[x];
val[rson]+=lazy[x];
minn[rson]+=lazy[x];
}
lazy[x]=0;
}
if(rev[x])
{
rev[lson]^=1;
rev[rson]^=1;
swap(lson,rson);
rev[x]=0;
}
}
void push_up(int x)
{
size[x]=size[lson]+size[rson]+1;
minn[x]=val[x];
if(lson)minn[x]=min(minn[x],minn[lson]);
if(rson)minn[x]=min(minn[x],minn[rson]);
}
void rot(int x,int kind)
{
int y=pre[x];
push_down(y);
push_down(x);
ch[y][!kind]=ch[x][kind];
pre[ch[x][kind]]=y;
if(pre[y])ch[pre[y]][ch[pre[y]][1]==y]=x;
pre[x]=pre[y];
ch[x][kind]=y;
pre[y]=x;
push_up(y);
push_up(x);
}
void splay(int x,int goal)
{
push_down(x);
while(pre[x]!=goal)
{
if(pre[pre[x]]==goal)
{
push_down(pre[x]);
push_down(x);
rot(x,ch[pre[x]][0]==x);
}
else
{
int y=pre[x];
push_down(pre[y]);
push_down(y);
push_down(x);
int kind=ch[pre[y]][0]==y;
if(ch[y][kind]==x)
{
rot(x,!kind);
rot(x,kind);
}
else
{
rot(y,kind);
rot(x,kind);
}
}
}
push_up(x);
if(goal==0)root=x;
}
void init()
{
root=tot=0;
size[0]=0;
memset(ch,0,sizeof(ch));
memset(pre,0,sizeof(pre));
}
void newnode(int &x,int k,int father)
{
x=++tot;
pre[x]=father;
size[x]=1;
ch[x][0]=ch[x][1]=0;
val[x]=k;
rev[x]=lazy[x]=0;
minn[x]=k;
// printf("val[%d]=%d,st[%d]=%d\n",x,k,k,x);
}
void buildtree(int &x,int l,int r,int father)
{
if(l>r)return;
int mid=(l+r)/2;
newnode(x,num[mid],father);
buildtree(ch[x][0],l,mid-1,x);
buildtree(ch[x][1],mid+1,r,x);
push_up(x);
}
int get_kth(int x,int k)
{
push_down(x);
int p=size[ch[x][0]];
if(p+1==k)return x;
else if(k<=p)return get_kth(ch[x][0],k);
else get_kth(ch[x][1],k-p-1);
}
int get_max(int r)
{
push_down(r);
while(ch[r][1])
{
r=ch[r][1];
push_down(r);
}
return r;
}
int get_min(int r)
{
push_down(r);
while(ch[r][0])
{
r=ch[r][0];
push_down(r);
}
return r;
}
int main()
{
int n,x;
int cas=0;
int q,a,b,c;
while(~scanf("%d",&n))
{
for(int i=1;i<=n;i++)
{
scanf("%d",&num[i]);
}
init();
newnode(root,INF,0);
newnode(root1,INF,root);
size[root]=2;
buildtree(root10,1,n,root1);
push_up(root1);push_up(root);
scanf("%d",&q);
char str[110];
//cout<<st[3]<<" "<<st[5]<<endl;
while(q--)
{
// debug();
scanf("%s",str);
if(str[0]=='A')
{
scanf("%d%d%d",&a,&b,&c);
if(a>b)swap(a,b);
int x=get_kth(root,a);
int y=get_kth(root,b+2);
splay(x,0);
splay(y,root);
lazy[root10]+=c;
val[root10]+=c;
minn[root10]+=c;
}
else if(str[0]=='R'&&str[3]=='E')
{
scanf("%d%d",&a,&b);
if(a>b)swap(a,b);
int x=get_kth(root,a);
int y=get_kth(root,b+2);
splay(x,0);
splay(y,root);
rev[root10]^=1;
}
else if(str[0]=='R'&&str[3]=='O')
{
scanf("%d%d%d",&a,&b,&c);
if(a>b)swap(a,b);
int m=b-a+1;
c=c%m;c=(c+m)%m;
if(c==0)continue;
int x=get_kth(root,a);
int y=get_kth(root,a+1);
int xx=get_kth(root,b-c+1);
int yy=get_kth(root,b+2);
splay(xx,0);
splay(yy,root);
int ps=root10;
root10=0;
push_up(root1);push_up(root);
splay(x,0);
splay(y,root);
root10=ps;
pre[ps]=root1;
push_up(root1);push_up(root);
}
else if(str[0]=='I')
{
scanf("%d%d",&a,&b);
int x=get_kth(root,a+1);
int y=get_kth(root,a+2);
splay(x,0);
splay(y,root);
newnode(root10,b,root1);
push_up(root1);push_up(root);
}
else if(str[0]=='D')
{
scanf("%d",&a);
int x=get_kth(root,a);
int y=get_kth(root,a+2);
splay(x,0);
splay(y,root);
root10=0;
push_up(root1);
push_up(root);
}
else if(str[0]=='M')
{
scanf("%d%d",&a,&b);
if(a>b)swap(a,b);
int x=get_kth(root,a);
int y=get_kth(root,b+2);
splay(x,0);
splay(y,root);
printf("%d\n",minn[root10]);
}
}
}
return 0;
}
poj-3580-SuperMemo-splay,布布扣,bubuko.com
原文：http://blog.csdn.net/rowanhaoa/article/details/31027839